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– slightly smaller than House Sparrow, longer-winged
– diurnal migrant, possibly nocturnal as well
– migrates singly, or (more regularly) in small, loose flocks
– usually not very vocal during migration

Common House Martin Delichon u. urbicum, 1CY
BIF3122, 13/08/2017, Innichen, Italy, Roland Neumann
– 1CY can show a more or less distinct greyish collar but never as broad and contrasty as in Sand Martin

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– not very vocal during migration
– monophonic flight call with inharmonic partials
– each call is a phrase consisting of three variable upslurs or overslurs
– uttered singly or as doublet
– main energy between 2,2 and 6kHz
– dry, hard, rolling impression
– quite different from other Swallows and Martins